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SPN 97 FMI 16

Water in Fuel Indicator — Value too high (moderately severe).
The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

What the SPN covers: Signals that the fuel/water separator has collected enough water to trip its sensor. More on SPN 97.

What FMI 16 usually points to: A developing over-condition that often precedes a derate. More on FMI 16.

Severity

MEDIUM — fix soon

Drain the separator soon. Water reaching a common-rail system can destroy injectors and pumps.

Likely causes

  1. Water collected in the separator bowl
  2. Contaminated fuel from the supply
  3. Faulty water-in-fuel sensor or wiring

Checks & fixes (easiest first)

  1. Drain the water separator
  2. Check fuel from the tank bottom for water
  3. Inspect the WIF sensor and connector
  4. Replace the filter element if contaminated

FAQ

What does SPN 97 FMI 16 mean?

Water in Fuel Indicator — value too high (moderately severe). The reading is above normal at a middle warning level — more serious than FMI 15, less than FMI 0.

Is SPN 97 FMI 16 serious?

Drain the separator soon. Water reaching a common-rail system can destroy injectors and pumps.

What should I check first for SPN 97 FMI 16?

Drain the water separator; Check fuel from the tank bottom for water; Inspect the WIF sensor and connector.